Fan blade H10200 is secured to the water pump hub, sandwiching the pulley in between with 4 SA505 cap screws and four WA5 lock washers. The blade is painted gloss black.
These are used on all 1934-36, all style cars, all engines.
There is an optional fan blade H10290 that is for “tropical climates”. This author has never seen one and does not know what it looks like.